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Full text of "Elby CGS758 Panther Series Utility LFO Owner's Manual"

Panther Series - CGS758 Utility LFO 




The Panther CGS7xx Series are authorised re-releases of the popular 
Cat Girl Synth Series of modules from Ken Stone. Each module is 
revisited to determine if any improvements can be added to the original 
design and has been adjusted, where applicable, to fit the smaller 
profile of the EuroRack module size. 



The CGS758 Utility LFO 



This board is a dual utility LFO offering manually variable wave shapes. 



Standard wave-shapes are a falling ramp variable 
through triangle to rising ramp, and variable pulse width. 
A fixed square wave is also available, as is a combination 
wave-shape that is variable between the SAW/TRI output 
and the SQUARE output. This is a MIX not a morph. 

Additional switches allow the variable outputs of the two 
LFO's to be intermixed. 



A little on how it works: 

The Utility LFO is based on the standard 

integrator/Schmitt trigger oscillator core. Two pots in the 

integrator charge path allow for the adjustment of speed, 

and along with two diodes, for the adjustment of charge 

versus discharge time. Changing this ratio will allow the 

triangle/saw output to be adjusted from falling ramp, to 

triangle to rising ramp. At the same time, the output of the Schmitt trigger will reflect this in 

the length of it output pulse. 




VAJBl OUT JOK VAH2 0UT SWAP 

— LFO 1 — — LFO 2 — 



ELS* DESIGNS - KEM STONE 
. 



A 0-volt referenced comparator, connected to the output of the integrator, generates a 
square wave as there is always an equal portion the ramp/triangle wave above the 0-volt 
reference, though adjustment of the shape of the ramp/triangle wave does change the 
phase of this square wave. 

Following the comparator is a buffered voltage divider to bring the square wave down to a 
more suitable level and also to drive one side of the variable output mixer pot. The other 
side of the variable output mixer pot is connected directly to the integrator output. The 
variable output is buffered, post mixer, by another op-amp. 



Elby Designs - Laurie Biddulph 

9 Follan Close, Kariong, NSW 2250, Australia 
elby designs@ozemail.com.au http://www.elby-designs.com 

lof 2 




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Designs 



Panther Series - CGS758 Utility LFO 



The two DPDT switches (JOIN and SWAP) allow the variable outputs of the two LFO's to 
interact:- 

• The JOIN switch interconnects the two VARI outputs by swapping their ramp 
outputs with each other, so that each output is a combination of that LFO's square 
wave with the other's ramp. 

• The SWAP switch reverses the outputs of the second LFO so that (when JOIN is 
on) one VARI output is a combination of both square waves while the other is a 
combination of both ramps. 

• When JOIN is off, SWAP merely reverses the direction in which the second LFO's 
VARI knob works. 



Power Requirements 


+12V @ 28mA, -12V @ 26ma 


Module Width 


18HP 



Elby Designs - Laurie Biddulph 

9 Follan Close, Kariong, NSW 2250, Australia 
elby desiqns@ozemail.com.au http://www.elby-designs.com 

2 of 2 




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Design